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Re: no gas in the carb, after it sets for a couple of...
To avoid the running out of fuel in the carb,one simple suggestion. Fit a Check valve ( metallic one ) between the fuel pump and carburetor.Always the non return to be on the side of the carburetor.
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At www.reliable-store.com get
complete guide on whether to repair or not, service it, and how to repair etc, along with wiring diagrams, electrical diagrams, torque specs, error codes, everything.
Tammy , weber has the pages to fix webers, why not read there.
its all there. for custom carbs,
fixing cars is a labor of love, if not, dont buy custom cars.
and for sure webers.
TAKE Photos of your work, its free now , no Kodachrome.
the car came with Autolite/motorcraft, carter or Rodcheter carb.
not webers.
idle, all carbs you can set the idle to zero. with the fly plate closed
and the engine stalls.
so does your butterfly plate close.
IDLE DOWN, HOT or cold engine,? is the choke OFF?
if the choke is off you can starve it of all air. at the stop screw.
if not, then the throttle cable is tight,
or you have air leaks in the plenum somewhere.
but air leaks cause lean, but with a bad tuned rich weber, it will race with air leaks, bingo???? im a carb o holic. retire.
I really can't give much advice. Since you have modified the original configuration, you're really on your own. If you had a 4 gas analyzer you could monitor the exhaust gas and figure out if the carb is adjusted as lean as possible, and if the timing is correct for what you are trying to do.
Do you know if the vac advance is working on the engine computer ?
And the air intake heater on the air cleaner ?
Check that your choke is working properly.
Start with a tune-up, new gas filter, air filter if dirty, oil and oil filter, spark plugs, distributor cap and rotor. If your spark plug wires are old, buy a new set, or test yours with an ohmmeter.
If still bad, check if your fuel pump is putting enough gas into the carburetor. Take the gas line off at carb. and check volume flow into a container. Also the carb may need adjustments-maybe the fuel level in carb. bowl is too low-would need to raise float height. Check if the needle valve and seat at the gas inlet to carb is not clogged or stopped from trash or debris.
Look down the throat of carb and watch for gas jetting out when you open the throttle to wide open-you should see gas spurt downward, if not, the carb needs some work to it.
Is your choke adjusted right? Sounds like it may not be-the choke flap should be nearly closed when starting, partially open after running, and fully open after the engine warms up.
Other problems could be weak ignition components-possibly a coil or igniter-what Toyota calls an ignition module.
Post back with what you find. Webers are great carburetors-much better than stock.
i would suggest to get the CO measured as sound's like to strong mix , petrol/air, there are also two diaphragm,s that if are old and lost flexability can affect the running , webber carbs are good until get problems , try these sites for more info
Hi,I have a 85 nissan 720 4x4 2.4 with a Weber carb,never had to mess with the timing chain,but I do have another engine in it.These trucks have carb, issues,I got rid of my stock carb,couldn't do nothing with it,dealer said they were junk,so I put a Weber on it and it is so awesome now.The valves should be adjusted when the engine is hot.Could be the person that put the new timing chain in did it wrong.Here's a video I did after I installed the Weber carb.I never had a issue with having to adjust the valves.My old carb at the end would always idle high.The timing might not of been set right with the new timing chain.I have the factory repair manual I bought from the nissan dealer.I've had my Truck since 92,it's mint,speedo has 343,000 miles on it,Jasper engine has 53,000 miles on it,transmission is a remanufactured one,it has 3000 miles on it. 85 Nissan 720 4x4 2 4 Weber conversion Here's the carb I put on it.Here's a cool Nissan 720 site to join,it cost 5 bucks,I am a member,it's like a forum where 720 owners react with helping each other,you have a page where you can post pics of your ride and you can see other peoples 720's. http://720world.com/Weber Carb Conversion fits Nissan Pickup 83 86 Z24 Electric Choke Weber...
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